强制转换类型失败

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TypeError: Error #1034: 强制转换类型失败:无法将 Object@a5ff821 转换为 mx.messaging.messages.IMessage。

TypeError: Error #1034: 强制转换类型失败:无法将 mx.managers::PopUpManagerImpl@96b4b99 转换为 mx.managers.IPopUpManager。
at mx.managers::PopUpManager$/get impl()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\managers\PopUpManager.as:68]
at mx.managers::PopUpManager$/addPopUp()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\managers\PopUpManager.as:169]
at mx.controls::ComboBox/getDropdown()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\controls\ComboBox.as:1463]
at mx.controls::ComboBox/get dropdown()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\controls\ComboBox.as:876]
at com.huawei.util::ComboCheckBox/onCreateCompleteHandle()[D:\ljp\workspace\OCSR\web\doc\OCSR_flex\src\com\huawei\util\ComboCheckBox.as:31]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:9440]
at mx.core::UIComponent/set initialized()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:1168]
at mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:718]
at Function/http://adobe.com/AS3/2006/builtin::apply()
at mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8744]
at mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8684]